i am using a design with a STM32F427 100pin package, and notice after leaving the board unpowered for several hours if i power up again, the software its not starting.
If i retry the restat the power it will stil not work, only after 3-4 retries.
If i have the change to get starting the software, then if i power off/on it still works.
Boot1 - pin is left floating
Boot0 pin - is tied to ground trough a 4K7 resistor
Reset pin - is tied to 3.3V trough 4k7 resistor.
Capacitors from pins 49,73 ( V_CAP) are 100nf X7R smd type
What is causing this strange behaviour?